Convert to all #pragma once

src/dds/logging.hpp

-#ifndef DDS_LOGGING_HPP_INCLUDED
-#define DDS_LOGGING_HPP_INCLUDED
+#pragma once
 
 #include <spdlog/fmt/ostr.h>
 #include <spdlog/sinks/stdout_color_sinks.h>
 #include <spdlog/spdlog.h>
-
-#endif  // DDS_LOGGING_HPP_INCLUDED

src/dds/proc.hpp

-#ifndef DDS_PROC_HPP_INCLUDED
-#define DDS_PROC_HPP_INCLUDED
+#pragma once
 
 #include <string>
 #include <string_view>
 proc_result run_proc(const std::vector<std::string>& args);
 
 }  // namespace dds
-
-#endif  // DDS_PROC_HPP_INCLUDED

src/dds/toolchain/toolchain.hpp

-#ifndef DDS_TOOLCHAIN_HPP_INCLUDED
-#define DDS_TOOLCHAIN_HPP_INCLUDED
+#pragma once
 
 #include <dds/util/fs.hpp>
 
 };
 
 }  // namespace dds
-
-#endif  // DDS_TOOLCHAIN_HPP_INCLUDED

src/dds/util.test.hpp

-#ifndef DDS_UTIL_TEST_HPP_INCLUDED
-#define DDS_UTIL_TEST_HPP_INCLUDED
+#pragma once
 
 #include <iostream>
 
     static_assert(true)
 
 }  // namespace dds
-
-#endif  // DDS_UTIL_TEST_HPP_INCLUDED